We don’t know exactly what the court order says. We don’t know what it is that you allegedly did that lead to the injunction. But if the order says you cannot contact his employer and does not specify a particular employer, one can reasonably conclude the order means you cannot contact his employer no matter who his employer is. Thus, if you know what person or firm employs him, you’d be barred from making the prohibited contact with that employer.
The fact that you are asking this question suggests that you are looking for a loophole to make contact with someone you know to be his employer, presumably to continue whatever it was that lead to the injunction in the first place. Do that, and you face a very real risk the court will find you in violation of the court order. If that is the situation, why are you so determined to keep this activity up?

